Mold making machine



pt 3 H. E. FELLOWS MOLD MAKING MACHINE 5 Sheets-Sheet 1 Filed May a, 1947 N$MN Pt. 8, 1953 H. E. FELLOWS 2,551,087

MOLD MAKING MACHINE Filed May 8, 1947 5 Sheets-Sheet 2 IIIIIlIII'" HII I.

I ,4 70 "INVINIOR AITORNCY Sept. 8, 1953 FELLQWS 2,651,087

MOLD MAKING MACHINE I Filed May 8, 1947 5 Sheets-Sheet 3 moanroe HHEE/Ja/VE Feuqw! MAMA M1 -r'roznlfl Sept. 8, 1953 H; E. FELLOWS MOLD MAKING MACHINE 5 Sheets-Sheet 4 Filed May 8, 1947 mulm-ol HH Rae/501v E. fie-41.0w!

AMnLM ATTORNEY$ Patented Sept. 8, 1953 UNITED s TATES PATENT OFFICE 2,651,087 1 MO D- A ING MACHINE Harrison Felltwisi Wauwato sa, Wis. Application May 8, 1947, Serial No. 3,835

12 Claims. (c1.22 s 1) This invention relates to a mold maki g chine for foundries.

It is a primary object of the invention to expedite the making of molds for match plate patterns by successive operations wherein the work of several men is mechanically coordinated so that each man, however unskilled,may perform a single operation with little or no physical exertion and with a minimum of handling of the cope, drag, and pattern.

It is a further object of the invention to permit a variety of molds of difiering sizes or character to be run simultaneously, and to enable the use of existing pattern and flask equipment with minor changes.

Other objects will appear more particularly in the following disclosure of my invention.

In the accompaying drawings:

Fig. 1 is a plan view of apparatus embodyin the invention.

Fig. 2 is a view in side elevation'of the apparatus shown in Fig. 1.

Fig. 3 is an enlarged detail view partially in section showing a flask inverting apparatus which is a part of the device shown in Fig. 1.

Fig. 4 is a view partially in front elevation and partially in section showing the apparatus of Fig. 3.

Fig. 5 is a view in perspective showing the disassociated parts of a flask for use in my improved machine.

Fig. 6 is a view partially in side elevation and partially in longitudinal section showing a jolt machine which is a part of the apparatus shown in Fig. 1.

Fig. 7 is a view partially in transverse section and partially in elevation throughthejolt machine shown in Fig. 6. I

Fig. 8 is a view in longitudinal section through a squeeze machine which isa part of the apparatus shown in Fig. 1. p

Fig. 9 is a view partially in elevation and par.- tially in transverse section through .the squeeze machine shown in Fig. 8.

Fig. 10 is a view partially in side elevation I 2 in horizontal section through the apparatus of Fig. '10 andFlg. 11.

. Fig. 14 is an enlarged fragmentary detail view in longitudinal section through a portion of the apparatus shown in Fig. 13.

.Fig. 15 isa fragmentary detail view on an enlarged scale taken in transverse section on the line l5|.5 of Fig. 14.

Fig. 16 is a detail view taken in section on the line 16-46 of Fig. 13 and showing the parts on an-enlarged scale.

The conveyor section I is continuous from its starting end 2 to the point-3'where it is interrupted. The conveyor is of a standard type on which work is manually propelled over the rollers 4 vwhich'havefixed mountings in a suitable frame t 5 Beginning at 6- and ending at 1, there is another like, but shorter conveyor section 8. Betwen the terminal end 3 of conveyor section I in the beginning 6 of'conveyor section 8, I provide at station B ajolt machine ID of construction hereinafterto be described. Beyond the terminal end 7 of conveyor section 8, I provide an inverting machine H of construction hereinafter to be described.

The returning side of the conveyor comprises a short section l2 which may beidentical with section 8,-having a receiving end I3 and a delivery end I4. -At station D there is another jolt machine atl5 which may be identical with that shown at 10. Beyond the jolt machine on the return: sideof 1 the conveyor, there is a section It having-a receiving end I! and delivery end I8; At station E, adjacent the delivery end of conveyor section i6, there is a squeeze machine [9. Beyond the squeeze machine, the conveyor continues with section 20 having a receiving end 2| and delivery end 22 leading to a draw machine 23 at station F- Beyond the draw machine, there .is'a conveyor section 24 having a receiving end 25- and a delivery end 26 leading to a close machine 21. "Beyond the close machine, the con- 'vey'or section 28 having a receiving-end 29 continues to any desired length.

There are suitable racks disposed at convenient points and including a pattern rack 30, a bottom board storage rack at 3| and a squeeze board 'rack'32. There is also a mold sand hopper 33 with a delivery spout 34 serving stations B and D.

For details ofthe vibrating or jolt machines shown at H) and I5 at stations B and D (these two machines being identical), reference is made -.to Figs..6 and -7. The jolt table35 is supported on piston 33 which operates in cylinder 31 disposed within the machine base 38. The interiors of the table and piston are hollow and arranged to be supplied with air under pressure through the air hose 39. There is a cavity at 40 in the end of the piston communicating through a duct with the hollow interior chamber 42 in which the air is stored. The skirt portion 43 which defines the cavity 40 in the end of the, piston serves as a valve which, in the course of piston reciprocation, clears an air outlet port 44 in the cylinder 31. The air passing the duct M to cavity 4.0 raises the piston and the table 35 until the air in cavity 50 can escape through port 44. ,Since'the duct M is of a diameter insufficient for the im-v mediate replacement of such air, the escape of the air confined beneath the pistonandtheahccd of the cylinder allows the entire table and piston, assembly to drop until air pressure again builds up in cavity 40 to a value sufficient to elevate the table. The resulting-vibration occurs, inaccords ance with standard practice, at :arat'e of 'perhaps 180 to 200 vibrations per minute.

A novel feature of the present machine consists in the provision of deep'transverse channels at in the table 35. In these channels are disposed the rolls 4 of a short conveyor section 45. The side bars 41, 40, upon which the rolls 4 are mounted in this section are each carried ontwo pistons 49. The cylinders 50, 5I at each sideof the machine have their head portions'communieating with a hydraulic pressure chamber 52 in which there is hydraulic liquid and to which the operator may admit, above the surface of such liquid, air under pressure from hoses 53, 54, subject to the control of a'common valve 55 which may be operated by a foot pedal 56 or otherwise.

The side frames 41, 48 are guided and also restrained as to their limit of vertiealmovementby the headed pins 51,-58 'shown'in Fig. 6-and' Fig.0.

The range ofvertical-movement of conveyor section 66 is such that, when elevated, it is substantially flush with the terminal end 3 of conveyor section I, at which time its rollers 4 are above the level of the vibratory'table 35. When the pressure on foot pedal 56 is released to vent the air pressure on the hydraulic-chamber 52 through the valve 55, the conveyor section drops its rollers 4 into the channels 45- of the table, thereby lowering on to the vibratory table any part which has arrived on the conveyor section to a point above the-table.

The flask inverting machine II is shown in detail in Figs. 3 and 4. Thereis a base 50 supporting base pedestals BI, 02 to which the side members 63, B4 of the oscillatory sub-frame -55 are individually pivoted at '65. The sub-frame sides provide open jaws. The sides are cross connected by webs at 56, 51 and 50. Upon the jaw portions spanned by web; 66 are mounted the side rails and rollersof a conveyor section. On the opposing jaw is mounted'a chamber 10 hich houses the pressure cylinder 1.2 having an. air connection at II. The cylinder 12 has a piston I4 supporting the movable tablet'lfi, which carries the side rails and rollers of conveyor section 11.

Mounted between thecolumnsfiI, 02 is a cylinder I8 pivoted at I0 to a support 80.. Connected with the piston rod 8I operable in such cylinder is a yoke 02 pivotally connected on the bar 83 which spans the space between suitable bosses and the subframe sides 63, 04 as shown in Fig. 4. Pressure quickly applied on cylinder 18, and quickly released, will cause the entire-sub-frame 65 to invert itself from either of itstwo positions bein Provided to the other, as indicated in dotted or full lines in Fig. 3. Pressure applied to the pressure cylinder I2 will raise the table 16 and conveyor I? to engage the fiask or mold on conveyor section 1! with conveyor section 69, whereby the cope and drag are held together during inversion between the full line position and the dotted line position of Fig. 3.

For details of the squeeze machine I0, reference ismade to'Figs. 8 and 9. In the particular device illustrated, the squeeze machine comprises a clamp having a fixed upper jaw supported by an arm 86 rising from base 81. The movable jaw comprises ,a'table 80 supported by a piston 89 having a. piston head 90 operating in a cylinder 9I within the base,-the head portion of the cylinder with a fluid supply connection 92. The guide bars 93, 94 connected with the table and reciprocable in suitable bearings in the base 8'! guide the table during its vertical movement.

Spanning the table is a ponveyor section 95 which normally rests on brackets 90, 97 carried by'the stationary conveyor section I8, 20; The table 88 istransversely channeled to receive the rollers 98 of conveyor section 95, the table normally being below the levelof work supported on such rollers. When pressure is applied in cylinder BI to raise the piston which supports the table, there is a certain amount of 10st motion between the table and the conveyor section. 95 until the rising table engages the rollers. At about the same time, or prior thereto, the top surface of the table will rise above the level of the rollers to'take from the rollers the weight of a workpiece mounted thereon. Thecontinued riseofthe table will lift the entire conveyor section 95 from its supporting brackets 96, 91 and the rise will continueuntil the Work is squeezed against the stationary pressure jaw 85.

For disclosure of the draw and close machines shown at F and H, referenceis made to Figs. 1 and 2 and Figs. 10 to 16. An endless conveyor chain '99 (Fig. 10 and Figll) is provided with arms I00 which support the chain from rollers IOI operating on anendless conveyor track I02, portions of which pass through the draw and close apparatus 23, 21 at stations F and H. These pieces of apparatus are very similar and at each the track I02 passes through the top of a housing I03 carried by a column I04. The housing I03 takes the form of an inverted channel provldedalong its lower margin with guide rails I05, I06 for the wheels I01, I08 of a cope carriage IIO Flanges II I, I I2 connected with the sides of the housing I03 above the rails I05, I06, overhang :the carriage. .0 to prevent it from being displaced upwardly.

r The pintles which connect the links of the conveyor chain 99 are extended downwardly to provide hangers II4 (see Fig. 14). Each of these is T-shaped, being provided with a cylindrical head H5, the several heads being connected with short lengths of rubber hose or rubber tubing IIIi as also shown in Fig. 14. Together the rubber tubes H5 constitute a virtually continuous driving clutch elementand support with which may be engaged the jaws II'I, I I8 which are pivoted on pintle II9 of carriage H0 and extend beyond the pintle to. engage a web I20 which serves to keep the jaws approximately centered.

Where the rails I05, I00 project beyond the easing I03 (Fig. 13), they aresupported by brackets -l2I from the conveyor track I02 (see also Figs. 10 and 16). As viewed in Fig. 13, the conveyor chain ismoving. from right to left. Spanning the space between two consecutive brackets I2I is a plate I 22 upon which I mount a clutch disengaging cam I23. Spanning the space between the pivoted jaws III, I I8 is a link I24 of adjustable length encircled, between the jaws, by a compression spring I 25 tending to open the jaws. Pivotally mounted on the link bolt I24 by pintle' I06 is a bell crank lever I 2'I having a cam surface I28 normally engaged with the jawI I I as shown in Fig. 15. At its upwardly extending free end the bell crank lever IT! has a cam follower roller I29 which, when engaged by the stationary cam I23 as shown in Fig. 16, tilts the bell crank lever to so manipulate the cam surface I28thereof as 'to permit the clamp jaws III, II 8" to separate under compression of spring I25 therebyrelea-sing the carriage from the propulsive action of the conveyor.

Mounted on the side of the housing I03is the control case I30 shown in Figs. and 11. Pivotally mounted therein is the control lever I3I which operates rods I32 and I33 slidably guided to move through the wall of the housing I03.

When the handle end of lever I3I is pushed inwardly from the position shown in Fig. 11, the end of plunger I33 enters the housing I03 in-the path of a stop member I34 carried by carriage IIII, thereby accurately to define the position at which the carriage will come to rest. When the operations at this station have been completed, the lever I3I may be moved to position shown in Fig. 11, whereupon the stop plunger I33 is retracted and the plunger I32 is advanced intocontact with the cam follower roller I29 thereby manipulating the bell crank lever I2'I to reengage the clutch jaws H1, H8 with the movable supporting and clutching tubes II6 suspended beneath the conveyor, therebyreengaging the carriage with the conveyor for movement out of housing I03.

At all points save those Where the tracks I05 are provided, the carriage will be suspended on the flexible supporting and propelling clutch tubes I I 6 hanging beneath the conveyor. As the tracks I05, I06 are encountered by the rollers I 08 of the carriage, the weight of the carriage is transferred from the conveyor to the tracks, but

the propulsion of the carriage by the conveyor continues until the clutch jaws are opened as shown in Fig. 16. There will be a considerable number of'such carriages moving with the endless conveyor circuitously about the conveyor track I02, but they will be spaced sufficiently far 'apart so that the operator will flnish using each and start it on its way before another arrives at the station. The usual motor switch (not shown) may also be used to stop the conveyorif, for any reason, it brings'a carriage to one ofthe stations before the operator-is through'with the preceding carriage at that station. I

Mounted directly beneath each housing I03fis a base I35 in which is disposed a; cylinder I 36 having a piston or plunger I3'I.- 'The'cro'sshead I36 on the upper-end of the plunger is connected With guide bars I39 havingsuitable bearingsfor vertical reciprocation in guidance of the plunger. Carried by the plunger centrally ofthe crosshead is a spherical bearing element I40 and universally pivotal on the bearing element I40 is a table I4-I having a concave recess complement'ary' toih e bearing element and embracing l80'fld'egrees thereof. Connected with the table'below the diametrical plane of such recess is a split segmental clamp I42 connected with the table andadapt'ed .to be tightened by a cam lever sand link I44.

By this means, the table may beheld in any'position of universal adjustment which it assumes on the spherical bearing element I40.

Spanning the table is a conveyor section I45 resting at its ends on brackets I46, I carried respectively by the end 22 of conveyor section 20 and the end 25 of conveyor section 24. As

in the case of similar conveyor sections previously described, this conveyor section comprises side rails and rollers. The rollers normally project above table level, but are receivable into channelsMB when the table is raised. Pins I49 on the sides of the table (Fig. 10) guide the conveyqr channels for the limited lost motion possible between the table and the conveyor. When the plunger I31 rises due tothe introduction of fluid under pressure in cylinder I36, the upward movement of the'table picks up the work from the several rollers of the conveyor section I45 and the continued upward movement of the table carries the conveyor section with it away from the supporting brackets I46,I4'I. The lowering movement of the table first deposits conveyor section I45 onthe said brackets and the continued lowering movement of the table withdraws it from support of the work, the load thereof being thereby restored to the conveyor rollers.

It is important to the use of the drawing and closing'machines that the molds or flasks be centered on the conveyor. For this purpose, the

projecting ends of the pattern plate I5'I (Fig.

10) while the hooks at the ends of the pivoted arms I56 are engageable beneath the complementary flanges I58 at the ends of the cope I59. The operation of the equipment is as follows An operator at station A takes from the receiving end of conveyor 2 aflask which has been placed thereon by an operator at station H as will hereinafter be described. The operator at station A'separates the cope and drag and gets the correct pattern from the pattern rack'30,

55 'cleans the pattern and assembles it between the cope and drag with the drag side of the flask uppermost. He then pushes the assembled flask down the conveyor to the operator at station B.

The operator at station E elevatesconveyor section 46 to the level of conveyor section I to 'fiaska'ssembly for the operation performed by him. J I The operator at station C gets the correct bottOin bQard' -IGII from the rack at 3|. AS'Sh es: that. followed at station B.

2-,,6-0 nos? in Fig. :and. Fig. 3,..the bottom board is provided with bars lfil which. will ultimately lie therebeneath but which are placed uppermost at this point- Rolling the flaskassem'bly on to conveyor section 'I'I of the roll-over machine shown in Fig. 3, the operator applies pressureto the cylinder I2 to elevate the flask until. the bars Hit of the bottom board contact the rollers of conveyor section. 69. The cope and drag are now clamped together on the pattern plate and the bottom: board is. clamped against the sand which fills the drag. Thereupon a charge. of compressedifiuid is delivered to the-cylinder .18 which inverts the roll-over jaWsleaving. the parts inthe position shownin dotted lines in. Fig. 3 whereby conveyor section GB-is registered with the receiving end 1'3 of conveyor section I2 leading to the second jolt machine. The clamping pressure on cylinder 12 is'nowreleased .and the operator pushes the assembly toward station D. The second jolt machine I5 at this station can be: omitted if it is not: desired to vibrate the sand in the cope, which is now uppermost. .At: station D, the copeis filled with sand, and if. a'jolt machine is provided at this station, the sand in the cope may be vibrated by the same procedure If loose sprues are used, they will probably be positioned by the operator at station D- before he fills the cope with sand. The finished mold is then pushed'by this operator toward station E.

The operator at station E- gets the correct squeeze board I62 from an appropriate rack such as that shown at 32, this board having smaller overall: dimensions than the cope. He places this board upon the sand in the cope and pushes the assembly into the squeeze machine shown in Figs. 8 and 9. The application of pressure in the head of cylinder 9i acts on piston 89 to raise the table 88 and thereby to elevate the entire assembly until the squeeze board contacts the fixed jaw 85 thereby imposing great pressure on the-sand. Relief of pressure lowers the table and the assembly until the conveyor section 95' again rests on brackets 96, 91 and picks the loaded assembly from the moving jaw table 88. The operator then returns the squeeze board tothe: rack, cuts the sprue hole or removes loose sprue, if necessary, and pushes the assembly toward station E.

The-operator in charge of the draw machine at station F pulls the assembly over the conveyor -sectionI45 until the stops I65 on the sidesof the drag flask I66 contact the end of theshoe IE3 or the centering mechanism. Centering. mechanism is then operated to center the assembly side which. is on the conveyor. If a flaskvibrating device is used, the vibrator hose is attached at this point (not shown).

Meantime a carriage III) has been. propelled by the conveyor 99 to a point where its rollers I01, 108 have been picked up on the rails I05,

-IOB, whereupon it has been detached. automatically from the conveyor by the stationary cam I23- acting on cam follower I29-as above described. The operator now pulls this carriage into position against the stop plunger I33. which locates the carriage directly above the centered mold. The table MI is now raised totake the load of the mold off of conveyor section I45 and to elevate the mold until the ears I58 of the cope displace the hooks I56 and are engaged over the hooks. At this point, the pattern plate is squared up at right angles to the motion of the-hoist by engagement; with the stops I.55.. Theupper-surw faces of the carriage will be forced. against the finished surfaces offlanges III and I I2 to: receive the thrust. Any uneveness of the bottom board I BD is compensated for by the tilting, of the table on its ball and socket mounting. The ball and socket joint is nowlocked andthe hoist is lowered by releasing. the pressure from cylinder I36. to permit the table to recede. Since the hooks I56 of. the carriage. are firmly engaged beneath the ears I58 of. the cope, the cope flask will be supported and the pattern and drag will be drawn from the part. of themold which is left hanging in the cope flask on. the carriage. As soon as it .is free, the operator manipulates. lever I3 I., pullacross the conveyor on to conveyor section 24,

where an operator at station G sets the core.

Meantime the cope has traveled overhead to the close machine 21 at station H until the carriage is automatically de-clutched from the conveyor on the track extension rails I05, I06 as above described. The operator at station H draws the cored drag mold into the close machine and centers it exactly as it was centered in the draw machine. He then pulls in and centers the carriage directly over the drag, raises the table until the cope has closed over the drag and finally manually releases the hooks from the cope and lowers the table with the completed mold. While the table is receding, he pulls the lever which releases the carrier stop and re-clutches the empty carriage to the conveyor. In the circuitous movement of the conveyor, the carriage is ultimately restored to the draw machine where the operation is repeated. The conveyor is the mechanical pace setter for the entire unit, as a predetermined number of carriages pass through the draw and close machines each hour unless, in an emergency, the conveyor movement is arrested as above mentioned.

With the completed mold resting on the bottom board on the discharge conveyor section 28, the. operator at station H now strips the flask from the mold and sets it on the return conveyor 1 within reach of the operator at station A for arepetition of the. sequence. of operations.

In the draw and close machines, the adjustment of the parts automatically effected by the various stops and tilting of the table assures a perfect draw and a perfect close irrespective of the skill of the operator, who has but to manipulate a few easily understandable mechanisms to get substantially perfect results.

It is also true of the remainder of the apparaquired, and no physical exertion beyond the liftplest of operations, no particular skill being reing of the empty flasks and patterns and boards.

At the same time, the apparatus is highly adaptable. Molds for quite dissimilar objects may be run through the machine in any sequence and the machine parts will handle them all in the same manner.

I have, in effect, provided two conveyor flights which are side by side. The first flight comprises conveyor sections I, 46, 8 and, [1 (section 45 being on the jolt machine at station B and section 1'! on the turn-over machine at station C). I

The other conveyor flight comprises conveyor sections 69, I2, 46, I6, 95, 20, I45, 24, I45 and 28 (section 69 is on the turn-over machine; section 46 on the second jolt machine at station D; section 95 on the squeeze: machine; section 145 occurs on each of the draw and close machines). By having these two conveyor flights run side by side in close proximity, I am able to dispose the turn-over machine at the delivery ends of the first flight and the receiving end of the second fiight'to receive the flasks from one flight and to deliver them to the other as above described, I am also able to have stations B and D directly opposite each other and immediately adjacent each otherto be served by a single sand hopper. I am also able to have the drawing station in close proximity to the starting station to facilitate the return of the patterns and flasks to the position where these are reassembled.

From a method standpoint, it is very advantageous to have the operations divided in order that they may be performed in the following sequence: Flask and pattern assembly; drag flask filling and jolting; application of bottom board and inversion; cope flask filling and jolting; squeezing the complete mold (with sprue hole out if required); drawing the cope andpattern; setting cores; closing the mold and stripping the flask.

Of course, the drawing and closing apparatus, duplicated at stations F and H, is of great importance in conjunction with the conveyor which sets the timing for the entire operation and relieves most of the manual labor involved. Elsewhere I have found it desirable that the pattern and flask assemblies be .moved manually from station, to station.

In all of the various machines which exert pressure or vibration, it will be noted that means is provided whereby the weight of the parts is shifted from the conveyor rollers to a suitable table to relieve the roller-bearings of the stress of the various jolting and pressure operations. 7

I claim: I

1. A mold making unit comprising the combination of a pair of conveyors disposed adjacent" each other in substantially parallel relation, the delivery end of one conveyor terminating adjacent the receiving end of the other, one of the conveyors having a flask filling station intermediate its ends, together with an inverting machine connecting said ends and providing means for transferring work from the said delivery end of one conveyor to the said receiving end of the other, the inverting machine comprising a machine base provided with a pintle, an invertible sub-frame pivoted on the pintle and comprising spaced conveyor sections adapted in the relatively inverted positions of the subframe to register endwise with the respective conveyors aforesaid, and means for moving one of said sections toward the other whereby work may be clamped between said sections during the inverting movement of said sub-frame.

2. In a device of the character described, the combination of a draw machine and a close machine each comprising a table and an elevator, the table of each machine being independently movable on its elevator between retracted and elevated positions, a relatively stationary conveyor section extending between the respective tables at the level of their respective retracted "riage from table. V "7. In a device "of'th'echaracter described, the

positions, and a second conveyor in an elevated position above the respective tables and extending between said machines.

3. In a device of'the character described, a draw machine and a close machine each including a table, an elevator for the table upon which thetable is'movable between elevated and retracted positions, a conveyor including a section between said machines and other sections normally extending over the respective tables in the retracted positions thereof and with respect to which the respective tables are substantially vertically movable to lift from the elevator sections last mentioned and restore to such sections the weight of workpieces delivered over the respective tables on said conveyor, and an overhead conveyor spanning the space between the respective machines and comprising a work supporting carriage independently toward and from which the respective tables are movable upon their respective elevators.

4. The combination set forth in claim 3 in which each of said machines comprises a track fjorfsaid carriage and said carriage is provided with clutch means engageable and disengageable with the overhead conveyor.

5. Thecombination set. forth in claim 3 in which each of said'machines comprises a track for said carriage and said carriage is provided with clutch means engageable and disengageable with the overhead conveyor, each machine comprising a clutch disengaging cam and a carriage centering stop.

6. In a device of'the character described, the combination with a conveyor including a work table having work positioning means and an elevator, of an overhead track, an overhead conveyor operable along said track, a carriage provided with a conveyor clutch for connection with the overhead conveyor, afixed' position carriage centering stop above the table and having a'member movable into the path of the'carriage to center the carriage above the work'positioning means on the table, and a handle provided with a connection with said stop member and with a clutch actuating member for the alternate operation thereof, whereby the carriage may be directly centered above the table to receive work centered thereon and the stop member removed from the path of carriage movement simultaneously with the engagement of the clutch to convey the carcenteredfposition and away from the combination with a conveyor, a vertically reciprocable elevator served by the conveyor, an overhead conveyor above the conveyor first mentioned and having a carriage track along the path of said overhead conveyor, and a carriage movable on the track and provided with a clutch for detachable connection of the carriage with said overhead conveyor, of a centering device on the elevator for positioning work thereon received from the first mentioned conveyor, a carriagecentering stop for positioning a carriage declutched from the overhead conveyor on the track directly above work centered on the elevator, and work engaging hooks connected with the carriage for engaging work lifted thereto by the elevator, whereby work delivered to the elevator from the conveyor will be aligned with a carriage declutched from the overhead conveyor for the automatic engagement of the carriage hooks with the work.

8. In a device of the character described, the

11 combination with a vertically reciproca'ble table and an elevator therefor, of a centering device connected with the table for positioning work thereon, an overhead conveyor, a carriage track along the path of said conveyor, a carriage movable on the track and provided with a clutch for connection with said conveyor, a carriagfi centering stop for positioning the carriage on the track directly above work on said table and work supporting hooks connected with the carriage for engaging work lifted thereto on said table, in further combination with a universally tiltable mounting fo s d able on said elevator. and wo positioning means connected with the carriage, said table being universally yieldable when work thereon is engaged by said positioning means.

9. In a device of the character described, the combination with a conveyor comprising supporting trolleys, connective links mounted thereon, and a flexible support comprising a continuous uniform surface throughout its length suspended from said links, of a carriage having relatively adjustable jaws movable to and from. clamping engagement with said flexible support for connecting and disconnecting the carriage with said conveyor.

10. In a device of the character described, the combination with a conveyor comprising supporting trolleys, connective links mounted thereon, and a flexible support comprising a uniform surface throughout its length suspended from said links, of a carriage having relatively adjustable jaws comprising a clutch movable to and from clamping engagement with said flexible support for connecting and disconnecting the carriage with said conveyor, said carriage having wheels, together with a track along which said wheels roll, a clutch disengager at one point along said track, and a manually operable clutch engager at another point alongsaid track.

11. In a mold making machine a pair of conveyors in side-by-side relationship for series movement of mold forming elements in opposite directions to and from a station. where one of said conveyors has its delivery end and the other of said conveyors has its receiving end, each of said conveyors having at said ends a separate conveyor section bodily movable into and out of alignment with its conveyor, a roll-over machine having a sub-frame upon which said separate conveyor sections are mounted in spaced relation and means for clamping the mold in assembled position on said sub-frame; said roll-over ma- 1'2 chine "being positioned in series between said conveyors, and said sub-frame being swinga lileto alternatively align said delivery section or said receiving section with mold elements thereon in position for travel on one or the other of said conveyors.

12. The mold making machine of claim 11, wherein said subframe is provided with a movable jaw portion as a mounting for one of said sections for movement toward and away from the other of said sections and comprising said clamping means.

HARRISON E. FELLOWS.

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